Supersnelle erbijsommen en erafsommen tot 20
In de mix
|
1.
1 + 13 =
3
14
2
1
|
2.
20 – 17 =
1
2
3
4
|
3.
11 – 8 =
3
4
2
1
|
4.
20 + 0 =
20
2
4
3
|
|
5.
15 – 8 =
2
7
3
1
|
6.
10 – 6 =
2
3
1
4
|
7.
4 – 3 =
3
4
1
2
|
8.
16 – 0 =
3
2
16
4
|
|
9.
8 + 5 =
1
2
3
13
|
10.
17 – 3 =
3
1
2
14
|
11.
2 + 8 =
3
10
1
2
|
12.
11 – 9 =
4
3
2
1
|
|
13.
16 – 12 =
2
4
1
3
|
14.
20 – 11 =
2
1
3
9
|
15.
8 + 8 =
4
3
16
2
|
16.
1 + 19 =
4
3
2
20
|
|
17.
2 + 6 =
2
8
1
3
|
18.
11 – 10 =
4
3
1
2
|
19.
15 + 3 =
18
2
3
4
|
20.
5 + 3 =
1
8
2
3
|